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Canon Japan already announced new iPF printers, the iPF 6400, 6450, 8400 and the 9400.
The announcement date for USA and Europe is expected to be 12 September. Check out the thread on this topic on the Luminous Landscape site, where Scott Martin gives valuable insights into these new printers.
Here is the link: http://www.luminous-landscape.com/forum/index.php?topic=69961.0
Anyway, I would suggest waiting till around the Photokina. You never know whether Epson will make an announcement as well - I have read on one site that Epson might make an announcement for their large format printers with availability in 2013, but I have no idea how credible that information is.